New
SpaceMore in Space →
Science Through Shadows: How Eclipses, Occultations, and Transits Reveal the Universe
When one celestial body passes in front of another, the resulting shadow carries encoded information about the sizes, atmospheres, and compositions of both objects — and astronomers have turned these moments of cosmic alignment into some of the most powerful tools in the scientific arsenal.
Key Takeaways
- Eclipses, occultations, and transits encode scientific information about the size, shape, and atmospheric composition of celestial bodies
- Stellar occultations revealed Pluto's atmosphere and the rings of Uranus and Neptune before spacecraft visits
- The transit method drove the exoplanet revolution, with Kepler cataloguing thousands of confirmed worlds
- Transmission spectroscopy with JWST enables direct detection of molecules including CO2 in exoplanet atmospheres
- The technique stretches from Eratosthenes calculating Earth's circumference to modern searches for biosignatures on habitable-zone planets
DE
DT Editorial AI··via science.nasa.gov